home.java

Enjoy Web Dev With Tapestry 一书的源代码

package com.ttdev.dynamicforms;

import java.util.*;

import org.apache.tapestry.*;
import org.apache.tapestry.annotations.*;
import org.apache.tapestry.components.*;
import org.apache.tapestry.form.*;
import org.apache.tapestry.html.*;
import org.apache.tapestry.valid.*;

public abstract class Home extends BasePage {
	public abstract User getCurrentUser();
	
	@InjectState("users")
	public abstract Users getGlobalUsers();
	
	public List getUsers() {
		return getGlobalUsers().selectAll();
	}
	@Bean
	public abstract ValidationDelegate getDelegate();

	@InjectComponent("userName")
	public abstract TextField getUserNameField();

	public abstract boolean isToDeleteUser();

	public void updateUser(IRequestCycle cycle) {
		if (cycle.isRewinding()) {
			getDelegate().setFormComponent(getUserNameField());
			boolean isInError = getDelegate().isInError();
			if (isToDeleteUser()) {
				getDelegate().reset();
				getGlobalUsers().delete(getCurrentUser().getId());
			} else {
				if (!isInError) {
					getGlobalUsers().update(getCurrentUser());
				}
			}
		}
	}
	public IPrimaryKeyConverter getConverter() {
		return new IPrimaryKeyConverter() {
			public Object getPrimaryKey(Object value) {
				return new Integer(((User)value).getId());
			}
			public Object getValue(Object primaryKey) {
				try {
					return getGlobalUsers().select(((Integer) primaryKey).intValue());
				} catch (RuntimeException e) {
					getDelegate().setFormComponent(null);
					getDelegate().record("User has been deleted", null);
					throw new PageRedirectException(getPageName());
				}
			}
		};
	}
}